Heater and cooker.



F. V. DETWILER. HEATER AND COOKER. APPLICATION FILED SEPT. s, 1910 Patented Mar. 17, 1914.

4 SHEETS-SHEET 1.

F. V. DETWILER.

HEATER AND COOKER. APPLIOATION FILED SEPT. s, 1910.

W 29 x5 1/ 7/; m 7/.

l (lay 7 F. V. DETWILER. HEATER AND COOKER.

APPLICATION FILED SEPT. s, 1910.

Patented Mar. 17, 1914.

4 SHEETS-SHEET 8.

J ".7. 2 v in z a z m F. V. DETWILER. HEATER AND COOKER.

APPLICATION FILED SEPT. 3, 1910.

1,090,289, Patented Mar. 17, 1914.

4 SHEETS-SHEET 4.

III II struction,

FOREST DETWILER, O! CHICAGO, ILLINOIS.

- HEATER AND COOKER.

Specification of Letters Patent. Application filed September a, 1910. Serial 1%. 580,419.

Patented Mar. 17,1914.

This invention relates ,to improvements in heaters and cookers, the surrounding walls of which are so constructed as to retain the heated air discharged thereinto when desired, and one of the objects of the invention is to provide an improved hollow receptacle having a passage for heated air therethrough and which is adapted to be used for cooking or heating articles either by placing the articles therein or on the top thereof, or both.

A further object is to provide an improved structure of this character having a central tubular passage for the heat, and improved means whereby the heated air from a single burner may be discharged into the passage and distributed e ually to various articles or receptacles locate on the top of the cooker. A further object is toprovide improved means for inducing circulation of the heated air through the cooker or heater:

A further object is to provide an improved structure of circulating flues, and improved means for securing the latter in position.

A further object is to provide an improved burner which is adapted to dischar e the products of combustion directly into t e hot air passage, and improved means whereby the burner may be reversed for directing the products of combustion away from the passage to discharge the same against a grating or broiler.

l A further object is to provide an improved grating or broiler attac ment. A further o-b'ect is to provide an improved structure of this character which will be simple, durable, cheap and compact in contion. To the attainment of these ends and the accomplishment of other new and useful objects, as will ap ear, the invention consists in the features 0 novelty in the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompan ing drawings, illustrating an embodiment o the invention, and in which Figure 1 is a erspective view of an improved device 0 this character constructed and effective and efiicient in opera- I the corner pieces 1n accordance with the principles of this invention. Fig- 2 is a detail view of a burner showing the same partly in elevation an partly in section. Fig. 3 is a vertical sectlonal View. Fi 4 is a detail sectional view on line 4 -1, Fig. 3. Fig. 5 is a sectional V ew on lme 5-5, Fig- 3. Fig. 6 is a sect onal view on line 6-6, Fig. 3. Fig. 7 is a detail. perspective view of one of the devices which forms circulating flues or passages. Fig. 8 IS a perspective view of one of the heat distributers or deflectors. Fig. 9 is a perspective. view of another form of heat distributing tube or passage.

' Referring more particularl to the drawngs and in the present exemp ification of the invention, the casin may be constructed of any desired or suita le material and may be of any desired size and configuration. In the present exemplification the surroundin upright walls 10 and the bottom 11 are pref erably formed of spaced members constructed of sheet material, and these spaced memhere are insulated from each other by any suitable inculating material 12, The bottom 11 is mounted upon suitable supports 1? preferably in the form of legs which are se cured to the'corners of the base, which latter is preferably of rectangular configuration. The surroundin walls are supported by the base and the a jacent corners of the walls are secured together in any desired or suitable manner, preferably by means of corner pieces 14. in the form of angle irons and these corner pieces are secured in position by means of suitable fastenin devices 15 in the form of bolts or the like, w ich pass through the corner pieces and also through the spaced members of the walls so that these members, as well as the insulation between hers, will be secured together. The surrounding walls may also be secured to the the membottom 11 in any suitable manner, preferably by means of angle irons 16 simllar to 14 which are arranged to engage the outer of the sides and bottom and similar fastening devices 15 may be employed for securing the angle pieces 16 in position.

The top, designated enerally by the reference numeral 17 in ig. 3, is constructed in a manner similar to the sides and bottom and is rovided with a-depending circumferentia flange 18. The top is of such a size that when it is placed upon the upper extremities of the surrounding walls, the

faces of the adjacent edges flange 18 will rest against the outer faces of the respective walls to embrace the upper edges of the walls and issecured in position by means of fastening devices 19, such as bolts or the like, which pass through the flange l8 and also through the adjacent portions of the surrounding walls. If desired,

with a central space 22, which may be of any desired configuration; In the present form of the invention it is shownas being rectangular and of a size to extend substantially across the bottom but of a width considerably less than the length of the casing.

Arranged within the casing and extending aroun the space 22 is an angular flange 23 (shown more clearly-in Fig. 6), which may be of any desired height, and the upper extremities of the flange incline or taper toward each other as at 24 and terminate short of each other, some distance above the bottom of the casing.

A burner 25 of any desired configuration is rotatably mounted in suitable bearings so located that the b'urner will stand within the space formed b the tapered or inclined portions 24: ofthe a'nge 23. This burner is adapted to burn any suitable fluid fuel, such as. gas, gasolene, kerosene or hydrocarbon oils, and receivesv its supply't'hrough a suitable supply pipe 26. The supply pipe 26 has communication with the burner 25 through a suitable connection 27, which latter is preferably in the form of a chamber with which'the tubular extremity 28 of the burner has communicatiomand a re lating valve 29 and an air mixer 30 of t e ordinary construction may beemployed for controlling the supply of fuel to the burner. This burner is provided with the ordinary jet openings on one side thereof, andis adapted to be reversed so that the heated air from the flame will be discharged upwardly or toward the top of the casing or downwardly toward the bottom of the casing at the W111 of the user and for a urpose to be hereinafter more fully set fortih.

Arranged within the casing is a tubular member designated generally by the reference numeral 31. This member is constructed of. any desired or suitable material but in the present exemplification of the invention the walls thereof are preferably constructed The bottom 11 of the casing is provided noaaase in a manner similar to the manner in which the walls of the casing are constructed, and is preferably of a rectangular confi uration, havin an internal diameter slightly larger than t e size of the opening formed by the extremities of the inclined portions 24L of the flange 23, and slightly larger than the burner 25. The tubular member is adapted to rest upon and be supported by the inclined portions 24 of the flan e 23, as shown more clearly in Fig. 3, an may beheld in posi tion by suitable fasteningv devices 32passing:

side thereof. The passage for heated airthus formed is also preferably of an external diameter less than the width of the casing, asshown more clearly in Figsa i and 5, and is of a height to terminate short of the top of the casing.

The tube or passage 31 for the heated air is enlarged at its upper extremity and this enlarged portion is preferably of a size to substantially fill the upper portion of the casing and may be formed in any desirable or suitable manner.- In the present exemplification of x the invention it is preferably formed separately from the tube or passage 31 for the heated air, and comprises a portion designated generally by the reference numeral 35, the bottomof which portion is referably inclined and extends downwardly romthe periphery toward the center thereof, at which point there is provided an opening 38. This opening 38 is of a size slightly less than the internal diameter of the heated air. tube or passage 31 and the enlarged portion 35 is secured to the heated air, tube or passage preferably by means of a circumferential flan e 37 projecting into the open ing 38 (see Fig. 9) in the bottom and which opening communicates with the tube or passage 31. The bottom of the enlarged portion 35 may be constructed in any suitable manner and of any suitable material but is preferably of a construction similar to the construction of the walls of the casing and the walls of the tubular passage 31. The enlarged portion 35 is preferably formed with a peripheral flange 39 shown more clearly in Fig. 9, which extends a short distance above the face of the bottom and the bottom is of such a size that the flange will engage and rest against the inner faces of the respective walls 10 of the casing and adjacent the top thereof so that the fastening devices 19 wiich secure the top 17 to the casing may be employed for securing the enlarged portion 35 of theheated air pastube or passage and the bottom 11 of the casing, on the respective sides of the tube or passage 31 are flue members which may be constructed of any suitable material such as sheet metal or the like. These flue memberspreferably comprise a bottom portion 40, depending from the opposite side edges of which are flange 41, and an upright portion 42 extending above another of the edges. thereof. This upright portion 42 is provided with laterally projecting flanges 43 extending from opposite edges thereof to project beyond the rear face of the portion 42, and the flanges 43 are arranged on the same sides as the flange 41. The flue members thus formed are placed within the casing on opposite sides of the tube 31 so that the flanges 43 will engage and rest against the inner faces of the respective side walls of the casing. When thus placed in position, the flanges 41 on the bottom 40 will rest against the inner face of the bottom 11 of the casing, and the members cotiperate with the respective walls of the outer casing to form flues. I

The bottom of the enlarged ortion of the tube or passage IS'PIOVidG with a plurality of apertures or openings 44 and these openings are located preferably 111 close proximity to the inner faces of the respective walls of the casing and in such positions that when the upright flue portions 42 are placed in position, the aperturespr openings 44 will have communication with the passages 45 (see Fig. 5) formed by the respective walls of the fiue members and the adjacent end walls of the casing. The portions 42 of the flue members are of a width to extend substantially across the casing as shown in Fig. 5,'so that heated air discharged through the openings 44 will enter the passages 45 to be discharged into the passage formed beneath the bottom 40 and between the flanges 41.

The bottom" 40 terminates adjacent the circumferential flange 23 around the space 22, and may be supported by means of brackets 46 secured to the flanges 23.

The flange 23 is provided with a plurality of apertures or o enings 47 (shown more clearly in Fig. 6)w ieh are arranged to form communication between the space within the flange 23 and the heated air passages below the bottom 40 to permit the heated air in the passages to be discharged through the flange 23 into the space formed by the flange and the inclined portions 24 to again enter the tube or passage 31. From the assage 31 the heated air will be discharged into the enlargd'portion 35 and from such portion through the openings 44 into the flues or passages formed by the members 42, 40, when the openings 21 in the to 17 are closed.

The upper extremities of t e portions 42 of the flue members may be held in position in any suitable manner, preferably by means of cars or projections 48 (see Fi s 3 and 7 which are adapted to project t rough the respective openings 44 1n the bottom of the enlarged portion of the heated air tube and to be flanged over one edge thereof.

The portions 42 of the flue members are preferably provided with one or more apertures or openings 49 in the top thereof and dampers 50 may be provided for controlling these openings. Openings 51 are also provided in the portion 40 of the flue members and dampers 52 are provided controlling these openings. I

A closure 53 is provided for the space 22 in the bottom of the casing and this closure may be provided with one or more openings or passages 54 for supplying outside air to the burner 25. Additional air openings or passages 55 may also be provided for supplying outside air to the burner and these passages are preferably in the form of tubular members, one extremity of which project's through the bottom 11 with the other extremity having communication with the space 22 below the burner 25 through the flange 23: p

In order to direct the heated air discharged into the passage 31 and from there into the enlarged portion to the openings 21 in the top 17, there is provided a cap 56 for the enlarged portion. This cap is constructed in any desired manner and of any suitable material, but is preferably of a construction similar to the construction of the remaining walls of the casing and the heated air tube. The cap is provided with a depending flange 57 which is adapted to embrace the peripheral flange 39 on the enlarged portion 35 and to rest against the inner faces of the adjacent surrounding walls of the casing so that the same fastening devices 19 may pass therethrough and serve as a means for securing the cap 56 in position. This cap 56 is provided with open ings 58 corresponding to the openings 21 in the top 17 and any desired number of these openings 58 may be provided, preferably one for each of the openings 21.

In order to secure the top 17 and cap 56 together around the openings 21, 58 to prevent the escape of heated air between the top and cap, the upper element of the top 17 is provided with a flange 59 projecting through each of the openings 21 and bent over the cap 56 on the inside. This flange is adapted to be deflected into the registering openings 21, 58 and to be flanged against the under face of the cap 56 preferably in the manner shown more clearly in Fig.3.

With this improved construction it will be apparent thatwhen the burner 25 is lighted,

. which may be accomplished in any suitable manner, such as by means of a pilot burner 60, and when vessels 61 are placed upon the openings 21 in the top 17, the products of combustion will be discharged from the burner into the tube 31 where they will pass into the enlarged portion 35 to be distributed thereby to the openings in the top. The heated air will then pass from the. enlarged portion 35 of the tube to be discharged into the flues formed by the members 42, 40 and adjacent the walls of the casing. Some of the heated air will be discharged from these flues through the openings 51 in the dampers of the fines, when-the dampers 52 are opened, to flow through the compartments or chambers 33, 34 to the top thereof and will pass from these compartments or chambers through the openings 49 when the dampers 50 are open and will continue to circulate in this manner. Some of the heated air will pass from these flues through the openings 47 in the flange 23 and be discharged into the space 22 below the burner 25. From this space it will be again forced into the tube or passage 31, the products escaping through the stove hole openings when'the latter are open and when closed,

theproducts will escape through the openings 641 when-"the respective closurestherefor are open. g

In order to supply suflicient outside air to the burner, the openings or passages'54, 55 are provided; in order to supply a sufflcient amount of air to prevent the formation of a yellow flame, and to ventilate the oven, openings 62 are provided through the walls 10 of I Y the casing located adjacent the bottom of the casing, with dampers 63 for controlling these openings. These openings 62 may also be employed to induce a circulation of the heated air across the stove holes.

As a further means to induce circulation of the heated air through the fines and to draw the heated air from the tube or passage 31, openings 64:, similar to the openings 62, are provided and are located preferably adjacent the upper extremities of the circulation fines and below the bottom of the enlarged portion 35, and dampers 65 similar to the dampers 63 are provided for controlling the openings. 64;. The openings 62 are also employed when it is desired to cause the heated air to circulate about the ovens.

It will be apparent that one of the open ings in the top 17 is located directly above the heated air tube or passage 31 and in order to prevent a greater. portion of the heated air from being conveyed tothis opening, and to equally distribute the heated ,nooonee fiectors project into the enlarged portion 35" to be spaced above the bottom thereof. With this arrangement, it will be apparent that the heated air discharged from the tube or passage 31, striking the deflectors, will be divided and asthe portions of thedeflectors which incline toward each other produce a restricted passage 68, the heated air will be divided, a portion of it passing through this restricted passage to the opening 21 directly thereabove, while the remaining portions will pass between the deflectors and the bottom of the enlarged portion 35 to be conveyed past the central opening in the top to the other openings.

Access may be had to the interior of the casing through suitable door openings in one of the walls thereof and these openings are provided with the usual closures 69.

The wall of the casin g which is provided with these door openings, is also provided with another and preferably smaller opening having a closure 70, through which access may be, had to the space 22 formed by the flange 23, one wall of the flange being omitted or provided with an opening adjacent the door opening, as shown more clearly in Fig. 6. A grating or broiler 71 is provided with openings72 in the bottom thereof through which air may circulate, and this grating or broiler is adapted to be removably supported upon suitable brackets 73 within thespace 22 below the burner 25. The grating or broiler is adapted to be inserted or removed through the opening closed bythe closure 70. When it is desired to employ the broiler for cooking purposes, it is necessary to discharge the products of combustion from the burner 25 against the broiler, but as. the openings in. the burner arev located in the u per side thereof, it is necessary to turn t e burner over so that the roducts of combustion will be discharged mm the bottom thereof. For this purpose the burner is rotatably mounted. In order to secure and hold it in its adjusted position, any suitable means may be provlded, such as an arm .74 (shown more clearly in Figs. 4 and 5) which is secured to the burner and is adapted to engage under a clip 75 when the et openings are located in one position and under a similar clip 76 when the jet openings are located in another position. In order that the clips 75, 76 may the compartments 33, 34, and suitable supports 78 may be provided for the bottom member 40 in the circulation flue.

While in the present exemplification of this invention, the casing is shown as of a rectangular construction and the heated air tube or passage 31 is also of a rectangular configuration, it is to be understood that these parts may be constructed in any desired shape and it is also to be understood that the enlarged portion 35 of the heated air tube may be modified in shape according to the number of holes provided in the top 17 of the casing. In the exemplification of the heated air tube or passa e and the enlarged portion 35 shown in ig. 9, the enlarged portion is shaped to accommodate a top provided with five holes to distribute the heated air to all of the holes, While in the remaining views the enlarged portion is shaped to accommodate only three holes. The term heated air in the specification and claims is to be construed to indicate the heated gases or products of combustion from the burner.

What is claimed as new is--' 1. The combination of a casing provided with a plurality of heat openings through the wall, a tubular flue centrally disposed therein and communicating at its outlet end with the said openings, said flue having a constricted inlet, a burner within the casing and arranged to discharge into the inlet, means for admitting external air to the burner, and one or more hot air circulation passages within the casing and having communication at their inlets and outlets with the said flue, there being a door opening in the casing whereby access may behad to the interior of the casing, said casing being provided with means for admitting external air to the said circulation passages.

2. The combination of a casing provided with a plurality of heat openings through the wall, a tubular flue centrally disposed therein and communicating at its outlet end with the said openings, said flue having a constricted inlet, a burner within the casing and arranged to discharge into the said inlet, means for admitting external air to the burner, means forming one or more of the air circulation passages within the casing and having communication at their inlets and outlets with the said flue, there being a door opening in the casing whereby access may be had to the interior of the casing, the

a casing havlng means for admitting external air to the said circulation passages and means for controlling the last said means.

3. The combination of a casing provided with a lurality of openings through the top, a tu ular flue within the casing and of a size considerably smaller than the interior of the casing, a portion of said flue extending across the top of the casing and having communication with all said openings, there being one or more outlet openings inthe wall of the referred to portion of the heated air passage, remote from the inlet of the said portion and beyond the first said openings, there bein one or more openings through the wall 0 the casing communicating with the outside air outside of the said portion of the passage in close proximity to the outlet openings in the said portion of the passage and with which openings in the wall of the casing the said outlet openings communicate for inducin circulation of the hot air across the first recited openings, and means for controlling the said openings in the wall of the casing.

4. The combination of a casing provided with a lurality of openings through the top, a tu ular flue within the casing and of a size considerably smaller than the interior of the casing, a portion of said flue extending across the top of the casing and having communication with all of the openings, there bein one or more outlet openings in the wall 0 the last referred to portion of the flue remote from the inlet of the said portion and beyond the first said openings, there being one or more openings through the wall of the casing communicating with the outside air and. outside of the said portion of the passage, in close proximity to and with which latter openings the said outlet openings communicate for inducing circulation of the hot air across the first recited openings, and means for controlling the said openings in the wall of the casing.

5. The combination of a casing provided with a plurality of openings through the top thereof, a centrally disposed flue within the casing of a size considerably smaller than the interior of the casing, said flue having communication with all of the openings and having a constricted inlet, a burner within the casing disposed to discharge into the inlet, spaced hot air deflectors arranged substantially at the outlet of'the constricted portion of the flue and inclinedtoward each other and against which the hot air impinges to be equally distributed between the openings, a chamber in the casing and hot air circulation passages within the casing having their inlets and outlets communicating with the said flue, there being door openings in the casing whereby access may be had to the interior of the casing, said hot air circulation passages also having openings communicating with the interior of the portion of the chamber exterior of the said flue.

6. \The combination of a casing provided with a plurality of openings through the top thereof, a centrally disposed flue within the casing of a size considerably smaller than the interior of the casing, said flue having .communication with all of the openingsand having a constricted inlet, a burner within the casing disposed to discharge within the inlet, spaced hot air deflectorsarranged substantially at the outlet of the constricted portion of the flue and inclined toward each other and against which the hot air impinges to be equally distributed to the said openings, means forming hot air circulation passages within the casing having their inlets and outlets communicating withthe said flue, there being door openings in the casing whereby access may be had to the interior of the casing, a chamber in the casing, said hot air circulation passages also having openings communicating with the interior of the portion of the chamber exterior of the said flue, and means for controlling the last said openings at will.

7. The combination of a casing provided with a plurality of openings through the top thereof, a centrally disposed flue within the casing of a size considerably smaller than the interior of the casing, said flue having communication with all of the openings and having a constricted inlet, a burner Within the casing disposed to discharge into the inlet, spaced hot air deflectors arranged substantially at the outlet of the constricted portion of the flue and inclined toward each other and against which the hot air impinges to be equally distributed to the said openings, and means forming hot air circulation passages within the casing having their inlets and outlets communicating with the said flue, there bein one or'more door openings in the casing w ereby access may be had to the interior of the casing, a chamber in the casing, said hot air circulation passages also having openings communicating with the im terior of the portion of the chamber exterior of the said flue, said casin having one or more openings in its walls or inducing cirportion of the flue and inclined toward each.

other and a ainst which the hot air impinges to be equal y distributed to v the said open ings, and means forming hot air circulation passages within the casing having their inlets and outlets in communication with the said flue, there being one or more door openings. in the casing whereby access may be had to the interior of the casing, a chamber in the casing, said hot air circulation passages also having openings in communication with the interior of the portion of the chamber exterior to the said flue, said hot air circulation passages also having communication with the outside air to induce circulation of hot air within the casing.

9. The combination of a casing provided with a plurality of openings through the top thereof, a centrally disposed flue Within the casing of a size considerably smaller than the interior of the casing, said flue having communication with all of the openings and having a constricted inlet, a burner Within the casing disposed to discharge into the inlet, spaced hot air deflectors arranged substantially 'at the outlet of the constricted portion of the flue and inclined toward each other and against which the hot-airimpinges to be equally distributed to the said openings, means forming hot air circulation pasv sages 'WIitl'llII the casing having their inlets and 1 out ets communicating with the said flue, there bein one or more door openings in the casing w ereby access may be had to the interior of the casing, a chamber in the casing, said hot air circulation passages also having openings communicating with the interior of the portion of the chamber exterior of the said flue, said hot air circulation passages also having openings in communication with the outside air to induce ci-rculation of heat therein and means'for-controlling the last said openings.

10. The combination of an inclosing casing, ovens therein and spaced from each other, the adjacent walls of the ovens cooperatin to form a hot air passage, a source of heat ischarging 'into the passage, said casing having stove holes opening through the top thereof, said ovens being also spaced from the top of the casing to form a hot air passage communicating wlth the passage between the ovens and with the said holes,

there being door openings whereby access may be had to the interior of the ovens through the casing, there being one or more openings in the wall of the casing adjacent the oven .tops for inducing circulation of the hot air across the stove holes and the tops of the ovens, hot air passages formed by the ovens-and casing and around the ovens communicating with the first said passage, there being one or more openingsin the wall of the casing communicating with thepassage around the ovens and with the outside air for inducing circulation through said passages and means individual. to the openings for controlling them.

maining adjacent walls to form hot air passages around the ovens communicating with the first two recited passages, there being door openings whereby access may be had to .the interior of the ovens through the casing.

12. The combination of an inclosing casing, ovens therein and spaced from each other, the adjacent walls of the ovens cooperating to form a hot air passage, and a source of heat discharging into the passage, said' casing having heat openings through the top thereof, said ovens being also spaced from the top of the casing to form a 'hot air air passage communicating with the passage between the chambers and the said openings, said ovens being also spaced from the remaining adjacent walls to form hot air passages around the ovens communicating with the first two recited assages, there being one or more door openings whereby access may be had to the in-' terior of the ovens and to the interior of the casing, there being one or more openings in the casing walls for inducmg circulation of hot air through all of said passages.

13. The combination of an inclosing casin ovens therein and spaced from each ot er, the adjacent walls of'the ovens cooperating to form a passage, a source of heat dischar ing into .thepassage, said casing having eat openings through the top thereof, said ovens being also spaced through the top of the casing to form a hot air passage communicating with the assage between the ovens and with the said openings, said ovens being also spaced from the remaining adjacent walls to form hot air passages around the ovens communicating with the first two-recited passages, there bein door openings whereby access may be ha to the interior of the ovens through the casing, there bein one or more openings in the casing walls or admitting external air to the passages to induce circulation of hot air therethrough.

14. The combination of an inclosing casing, ovens therein and spaced from each other, the adjacent walls of the ovens cooperating to form a hot air passage, a source of heat discharging into the passage, said casing having heat openings in the top thereof, said ovens being also spaced from the top of the casing to form a hot air passage communicating with the passage between the ovens and with the said openings, said ovens being also spaced from the remaining adjacent walls to form hot air passages around the ovens communicating with the first two recited passages, there being door 0 enings whereby access may be had to the interior of the ovens through the easing, there being openings in the casing for admittin external air to the passages to induce circulation of hot air therethrough and means for controlling the last said means at will.

15. The combination of a casing, a centrally disposed hot air passage having an inlet and an outlet, hot air circulation passages in the casing having communication with the inlct and outlet of the first recited passage, said casing forming a portion of the passages, said casing having a plurality of openings in its top with which the passages communicate, means within the first recited passage for deflecting the hot air to distribute the heat to the openings, a burner arranged to discharge into the said inlet, a grating suppoited below the burner adjacent the inlet, and means for reversing the burner to discharge the heated air against the gratmg.

16. The combination of a casing, a centrally disposed hot air passage having an inlet and an outlet, hot air circulation passages in the casing having communication with the inlet and outlet of the first recited passage, said casing forming a portion of the passages, said casing having a plurality of openings in its top with which the passages communicate, means within the first recited passage for deflecting the hot air to distribute the hotair to 'the openings, a burner arranged to discharge into the said inlet, a grating supported below the burner adjacent the inlet, means for reversing the burner to discharge against the grating, and means for securing the burner in its adjusted position.

17. The combinationof a casing, a centrally disposed hot air passage having an inlet and an outlet, hot air circulation passages in the casing having communication with the inlet and outlet of the first recited passage, said casing forming a portion of the passages, said casing having a plurality of openings m its top with which the passages communicate, means within the first recited passage for deflecting the hot air to distribute it to the openings, a burner arranged to discharge into the said inlet, a grating, means for removably supporting the grating adjacent the inlet of the passage, and means for reversing the burner to discharge against the grating.

"18.'-The combination of a casing, a centrally disposed hot air passage having an inlet and an outlet, hot air circulation passages in the casing communicating with the inlet and outlet-of the first recited passage, said casingjorming aportion of the passages, said icasing havin a plurality of openings in its top with w ich the passages communicate,-means within the first recited passage for deflecting the hot airto distribute it to the openings, a burner arranged to discharge into the said inlet, a chamber 'within the casing adjacent and communicating with the hot air passage below the,

burner, a grating, means for reversing the burner to discharge against the grating, and

' means whereby the grating may be removed from and placed into the chamber and through the wall of the casing.

19. The combination of a casing, a centrally disposed hot airassage having an low the burner, a grating, means for revers-- ing the burner to discharge against the grating, said chamber having communication with the outside air, and means whereby the grating may be removed from and placed into the-chamber through the wall of the casing. I

20. The combination of a casing, a centrally disposed hot air passage having an inlet and an outlet, hot air circulation passages within the casing having communication with the inlet and outlet of the first recited passage, said casing forming a portion of the passages, said casing having a plurality of openings in its top withwhich the passages communicate, means within the first recited passage for deflecting the hot air to distribute it to the openings, a burner arranged to'discharge into the said inlet, a chamber within the casing adjacent and communicating with the hot air passage below the burner and opening through thead jacent wall of the casing, a removable closure for the last recited o ening, a grating removably supported in t e chamber, and means for directing the heated air-from the burner into the passage above the grating or against the grating at will.

21. The combination of a casing, a centrally disposed upright. tubular hot air passage therein and having an outlet and a constricted inlet, said casing having a plurality of spaced openings through the top and said outlet having communication with each passages for the hot air from the inlet, and

a source of hot air discharging into the inlet, means forming hot air circulation passages spaced from the first recited passages and adjacent the walls of the casing, a portion of said circulation passages being formed by'a portion of the casing and having communication with the lateral passages adjacent the walls of the casing and remote from the said openings and also with the said inlet, whereby the hot air from the inlet will be drawn across the said openings, there being one or more door openings whereby access may be had to the inten'mr of the casing through the walltherof.

22. The combination of a casing, a centrally disposed upright tubular hot air passage therein having an outlet and a constricted inlet, said casing having a plurality of .spaced openings throughthe top and of the openings to form extended lateral said outlet having communication with each.

passages for the hot air from the inlet and a source of heat discharging'into the inlet,

means forming hot air, circulation passages spaced from the first recited passage and adacent the walls of the casing, said walls forming a portion of the passages,sa1d circulation passages having communication with the lateral passages about the walls of the casing andremote from the saidopenings and also with the said inlet, whereby hot air from the inlet will be drawn across the said openings, said hot air circulation passages also having direct communication with the interior of the casing, there'being one or'more door openings whereby access may be had, to the interior of the leasing through thewall thereof. v h p f 23. The combination of'a casing, a hentrally disposed upright tubular-hot air passage therein having. an outlet andva constricted inlet, said casing havifig a plurality of spaced'openings through the top and said outlet having communication with each of the openings to form extended lateral passages for the hot air from the inlet, a source of heat discharging into the inlet, means forming hot air circulationpas'sages spaced fromthe first recited passage and ad acent the walls of the casing, said walls forming a portion of the passages, said circulation passages having communication withrthe lateral passages adjacent the walls of the casing and remote from the said openings and also with the said inlet, whereby hot air from the inlet will be drawn across the said openings, said hot air circulation passages being also provided with openings com:

municating directly with the interior of the casing, and means for controlling said openings, there being one or more door openings whereby access may be had to the interior of the openings to form extended lateral! of the casing through the wall thereof.

24. The combination of a casing, a centrally disposed upright tubular hot air passage therein having an outlet and a constricted inlet, said casing having a plurality of spaced openings through the to and said outlet having communication wit each of the openings to form extended lateral passages for the hot air from the inlet, and a source of heat discharging into the inlet,

the outside air for inducing circulation of hot air through the passages, there being a door opening whereby access may be had to the interior of the casing.

25. The combination of a casing, a centrally disposed upright tubular passage therein having an outlet and a constricted inlet, said casing having a plurality of spaced openings through the top of said outlet having communication with each of the openings to form extended lateral passages for the hot air from the inlet, a source of heat discharging into the inlet, means forming hot air circulation passages spaced from the first recited passages and adjacent the walls of the casing, said walls forming a portion of the passages, said circulation passages having communication with the lateral passages adjacent the walls of the casing and remote from the said openings and also with the said inlet whereby the hot air from the inlet will be drawn across the said openings, said circulation passages also having communication with the outside air for inducing circulation of heated air therethrough, and means for controlling the last recited passages, there being one or more door openings whereby access may be had to the interior of the casing.

26. The combination of a casing, a centrally disposed upright tubular passage therein having an inlet and an flared outlet extending substantially to the opposite edges of the casing in one direction and spaced from the other opposite edges in the other direction, said casing having a plurality of spaced openings through the top and said outletjhaving communication with each of the openings.

27 The combination of a rectangular casing, of a centrally disposed upright tubular passage having an inlet through the bottom of the casing and a flared outlet extending to the opposite sides of the casing in one direction and spaced from the other opposite sides of the casing in the other direction, said casin having a plurality of spaced openings t rough the top communicating with the outlet of the tubular passage.

28. The combination with a casing having a bottom opening and top openings, of a centrally disposed upright tubular member formlng communication between the' lower openin in the casing and all of the openings in t e u per wall of the casing, the upper end of t e tubular member being forined with a flared outlet portion which inclines downwardly toward the central portion of the tubular member.

29. The combination of a rectangular casing formed with a central bottom opening and with a plurality of openings in the top, of an upright centrally disposed tubular member forming communication from the bottom opening through the casing to all of the top openings, the tubular member being formed at its upper end with an inclined outwardly flared outlet extending below the openings in the top of the casing to the opposite sides of the casing in one direction and the other opposite sides of the flaring portion being spaced from the corresponding opposite sides of the casing.

30. The combination of a casing formed with a plurality of openings in the top thereof, of a centrally disposed tubular member forming a passage with a restricted upper end and a flaring outlet incllned toward the centrally disposed portion, the outlet being disposed beneath the openings in the casing, and deflectors disposed in the restricted portion of the passage to divert an upwardly passing current of air from the central passage to the outer edges of the inclined flaring portion.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 1st day of September, A. D. 1910.

FOREST v. DETWILER.

Witnesses J. H. JooHUM, Jr., C. H. SEEM. 

